Air cleaner and silencer assembly



Sept- 17. 1940- H. s. KAMmvn-av AIR CLEANER AND SILENCER ASSEMBLY 2 Sheets-Shut 1 Filed Dec. 21, 1935 R NN IE; N@ w f s@ Y A Q mw l gm Q mi! Il, A NN N l, xV,.. H i -u a. s n m. m wk Q TQQ Sme/who@ e/Mfg @amm/ my y Sept. 17, 1940. H. G. KAMRATH 2,214,731

AIR CLEANER A'ND`SILENCER ASSEMBLY Filed Dec. 21, 1935 2 Sheets-Sheet 2 gnomi/cm .We/16M@ Kanzlei/ mamfy Patented Sept. 17, 1940 UNITED STATES PATENT OFFICE AIR CLEANER AND Herbert G. Kamrath,

SILENCER ASSEMBLY Flint, Mich., assgnor to Application December 21, 1935, Serial No. 55,524

1 Claim.

This invention has to do with the construction and installation of air cleaner and silencer assemblies.

The principal objects of the invention are to provide an oil bath type carburetor air cleaner and resonator intake silencer assembly whose vertical dimension is minimized and to install this assembly on an internal combustion engine equipped with a downdraft carburetor so that it occupies the least head room. An important feature of the invention is a. connection between the air cleaner and silencer elements of the assembly which prevents oil from the air cleaner assembly entering the silencer element.

For a better understanding of the nature and objects of the invention, reference is made to the following specification wherein there is described the preferred embodiment of the invention which is illustrated in the accompanying drawings.

In the accompanying drawings l1 Figure 1 shows, partly in side elevation and partly in section, an air cleaner and silencer assembly in which my invention is embodied.

Figure 2 shows the assembly shown in Figure l installed on an internal combustion engine in accordance with my invention.

Figure 3 is a perspective view of the air cleaner end of the tube which connects the air cleaner 30 and silencer elements of the assembly shown in the preceding figures.

Figure 4 is a perspective view of the air cleaner end of a modified form of the tube shown in Figure 3.

The assembly shown in-the drawings, resembles generally that shown in Figure 1 of my prior application Serial No. 41,999, filed September 25, 1935, but is an improvement thereover in several respects. It consists of a resonator silencer ele- 40 ment IIl'and an oil bath type air cleaner element II of the type shown in Figure 3 of the-Blair application Serial No. 50,755, led November 20, 1935. To minimize the vertical dimension of the assembly and the head room it will occupy when installed in accordance with my invention, the silencer element is disposed horizontally and the air cleaner element, which. must be disposed vertically, is connected to the outer end of the silencer element so that, while it e'xtends below, it does not project above the silencer element.

The air cleaner element II includes a gener ally cup-like member I2 and a tube I3 which extends through and is secured in an opening in the bottom of the cup-like member so that it forms therewith an annular receptacle which is lled with oil I about the level of the ledge I4 before the air cleaner is put into operation. Within the up', er end of the body I2-I3, there is located a hollow annular member I5 which is filled with a suitable, preferably metal, lter medium 23. In the upper and lower end walls of the member I5, there are provided annular openings 20 and 2I which are bridged by narrow bars 22 which are integral with the walls. To the lower wall of the member I5, between the opening 2I and its inner edge, there is secured a generally frusto-conical bale I6 which is riddled with small openings Il and whose outer edge is telescoped snugly Within the riser I8 in the bottom of the body I2I3. The baffle I6 inhibits splashing of the oil in the bottom of the body I2-I3 and prevents the air carrying too much oil into the filter element I5--23 and therebeyond when air is traveling through the air cleaner at a rapid rate.

The filter element I5-23 is supported from the upper end of the tube I3 through an annular member 25 which is secured to the inner cylindrical wall of the filter element. The hollow annular member I5 is made of such shape and size that, when the filter element is installed in the body I2--I3, its lower outer edge is located somewhat above the outer portion of the bottom of the body and there is left between the outer walls of the iilter element and the body an annular space 26.

The lower end of the tube I3 is closed by a cap 21 through which there extends a stud 28, whose inner end is internally threaded. The upper ends of the filter element I5-23 and the tube I3 are closed to the atmosphere by a deep cover 29 of inverted cup-shape which is supported on the upper end of the outer wall of the lter element. It will be noted that the outer wall of the filter element extends upwardly beyond the outer wall of the body I2I3 and that the cover 29 extends outwardly beyond the outer wall of the lter element and defines with the upper edge of the outer wall of the body an air intake opening 3l. The body I2-I3, the lter element I 5--23, the cap 2l and the cover 29 are yheld in assembled relation by a wing screw 32 which bears on the outer surface of the cover and is screwed into the inner end of the stud 28.

The silencer element IB includes a shell I9 which consists of a cylindrical wall 33 and outer and inner end walls 34 and 35. In an opening in the outer end wall 34, there is secured a tube 38 which extends into an opening in the inner end Wall 35 and constitutes a duct through which air may travel through the shell. In the opening in the inner end wall 35, there is secured a tube 3'! which encircles and is radially spaced from the inner end of the tube 36. To the inner end of the shell, there is connected, through an annular element 38 which is secured to the cylindrical wall 33, the open end of a generally cup-shaped adapter 39 which constitutes an extension of the duct 36. In the flat side of the adapter 39, there is provided an opening which is encircled by an outwardly extending collar 40 which is inclined toward the outer end of the silencer element.

The compartment deiined by the tubes 36 and 3l and the walls 33, 34 and 35 is divided into three chambers Lil, 42 and 43 by partitions 44 and which are secured to the shell i9 and to the tubes 36 and 3l, respectively. The chamber 4l is connected to the duct 36-39 by openings Ll in the tube 30 and with these openings constitutes a simple bottle type resonator. The chamber i3 is connected to the chamber 42 by a tube 46 which extends through the partition 45 and the chamber 42 is connected to the duct 36-39 through the annular space 24 between the tubes 36 and 3l. The chamber 43, the passage 26, the chamber 42 and the passage 24, together, constitute a compound bottle type resonator.

The tube 36 extends outwardly beyond the outer end wall 34 of the silencer element and radially into the cover 29 of the air cleaner element through an opening in its side wall which is encircled by an outwardly projecting ange 30 into which the tube fits snugly. The tube 36 is secured to the cover 29 so that the collar 40 on the adapter 39 extends at a high angle to the axis of the air cleaner element, preferably, by a solder joint 52 within the cover so that it will not be necessary to apply soldering flux, which would impede the subsequent application of paint. to the outside of the cover and tube.

The outer end of the tube 36 extends into the cover 29 to a point vertically above the upper end of the tube I3. The upper side of the outer extremity of the tube 36 is cut back with respect to the lower side thereof so that air will be drawn from the top and center rather than from one side of the cover 29 and there will, consequently, be a circumferentially uniformly distributed flow of air through the passage 26 and the filter element |5-23 when the assembly is in operation. The cut back may be provided by notching the upper side of the outer extremity of the tube 36, as indicated by the reference characters 53 in Figures 1 and 3 or bevelling it, as indicated by the reference character 54 in Figure 4. In either event, the projecting lower side of the tube 36 will serve as a bailile to prevent the -air carrying oil from the air cleaner element into the tube. The funnel-shaped member 55 secured to the stud 28 is provided to serve as a pilot for the screw 32. This in order to make easier the entering of said screw into the hole tapped in the stud 28.

The assembly shown in the drawings was de- -sgned for installation on internal combustion engines equipped with downdraft carburetors located at the sides of the engines to clean the air which enters the carburetors and silence the socalled intake noises of the engines. It is preferably installed on such engines in the manner shown in Figure 2.

The engine 48, which is shown in Figure 2, is equipped with a downdraft carburetor 49 which is. located at one side of the ,engine and whose air intake tube opens upwardly. To connect the assembly shown in the drawings to the carburetor 49, there is provided an elbow 56 whose lowerv end is connected to the air intake tube of the carburetor and whose upper end extends above and faces in the direction of the engine.

The assembly is installed on the engine with the air cleaner element l I in an upright position and the collar 40 of the adapter 39 telescoped within the upper end of the elbow 5U. In order to minimize the head room required by the assembly, it is installed with its longitudinal axis at such an angle to the longitudinal axis of the engine as to locate the air cleaner element entirely to the side of the engine on which the carburetor 49 is located and at such an elevation that those portions of the assembly which extend over the top of the engine just clear it. The inner end of the assembly is, of course, supported by the carburetor through the elbow 50. To support the outer end of the assembly, there is provided the bracket 5I which is secured at one end to the engine and at the other end to the lower end of the stud 28.

When the assembly is installed in the manner described and shown in Figure 2 and the engine is operating, the engine suction draws air, through the opening 3|, the passage 26, the lter element |5-23, into the cover 29 and, thence, through the tube 36, the adapter 39 and the elbow 50 into the carburetor and cylinders of the engine. During the course of its travel through the air cleaner element, the air is, of course, freed of foreign matter and it will be understood that the resonators 41-4I and 24--42-46-43 are tuned, as set forth in the Wilson application Serial No. 470,700, iiled July 25, 1930, so that they respond to and attenuate by resonance the sound waves to which the intake noises of the engine are due.

I claim:

In an air cleaner, an annular receptacular member which constitutes a liquid reservoir. an annular lter element with an air entrance orice in its lower wall and an air outlet orifice in its uD- per wall disposed within the receptacular member with its inner wall encircling the inner wall of the receptacular member and its outer wall encircled by and spaced from the outer wall of the receptacular member so that it denes therewith a passage through which air travels from the atmosphere toward the air entrance orice in the filter element, a domed cover into which air passes from the air outlet orifice in the filter element disposed over the upper end of the filter element, and a tube through which air is conducted from the cover extending laterally through the Side wall of the cover above the upper end of the filter element to within the connes of a projection of and above the inner wall of the filter element with an upwardly opening mouth at its inner end.

' -fHERBER'r G. KAMRATH.

CERTIFICATE OF CORRECTION.

Patent No. 2,21LL,751. september 17, 191m.

HERBERT G. KAMRATH.

It is hereby certified that error appears in the printed speqifioation ofthe above numbered patent requiring correction as follows: Page 1, first column, line l5, for the word "assembly" read e1ement'; page 2, first coiumn, line 56, for "high" read--right--3 line 55, for "characters" read --character--y-and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the-(case in ythe Patent office.

signed and sealed this 29thday of october, A. D. 191m.

, Henry Van Arsdal'e, (Seal) Acting Commissioner of Patents. 

